<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <title>CSS 2.1 Test Suite: Length Units</title>
  <style type="text/css"><![CDATA[
   .container { font: 15px/1 Ahem; background: url(support/swatch-red.png) 45px 0 repeat-y; }
   .zero {margin-left: 0;}
   .one {margin-left: 3em;}
   .two {margin-left: 3.75ex;}
   .three {margin-left: 45px;}
  ]]></style>
  <link title="4.3.2 Lengths" href="http://www.w3.org/TR/CSS21/syndata.html#length-units" rel="help"/>
 </head>
 <body>
  <p> There should be a solid vertical bar of green below. </p>
  <div class="container">
   <div class="zero">    X </div>
   <div class="one"> X </div>
   <div class="two"> X </div>
   <div class="three"> X </div>
  </div>
 </body>
</html>